CHECK POWER SUPPLY FOR PRESSURE SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the pressure switch harness connector.

3) Turn the ignition switch to ON.

4) Measure the voltage between pressure switch harness connector terminal and chassis ground.

Connector & terminal

(B10) No. 2 (+) — Chassis ground (−):

QUESTION

Is the voltage 10 V or more?

Yes No

Check for open or short circuit in the harness between fuse and pressure switch.